Github user laurentgo commented on a diff in the pull request: https://github.com/apache/drill/pull/578#discussion_r85804609 --- Diff: exec/java-exec/src/main/java/org/apache/drill/exec/rpc/security/AuthenticationMechanismFactory.java --- @@ -0,0 +1,169 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.drill.exec.rpc.security; + +import com.google.common.base.Function; +import com.google.common.base.Strings; +import com.google.common.collect.Iterators; +import com.google.common.collect.Sets; +import org.apache.drill.common.AutoCloseables; +import org.apache.drill.common.config.DrillConfig; +import org.apache.drill.common.map.CaseInsensitiveMap; +import org.apache.drill.common.scanner.persistence.ScanResult; +import org.apache.drill.exec.ExecConstants; +import org.apache.drill.exec.exception.DrillbitStartupException; +import org.apache.drill.exec.rpc.security.plain.PlainMechanism; +import org.apache.drill.exec.rpc.user.security.UserAuthenticator; +import org.apache.drill.exec.rpc.user.security.UserAuthenticatorFactory; +import org.apache.drill.exec.security.LoginManager; + +import javax.annotation.Nullable; +import java.lang.reflect.Constructor; +import java.lang.reflect.InvocationTargetException; +import java.util.Collection; +import java.util.List; +import java.util.Map; +import java.util.Set; + +public class AuthenticationMechanismFactory implements AutoCloseable { + private static final org.slf4j.Logger logger = + org.slf4j.LoggerFactory.getLogger(AuthenticationMechanismFactory.class); + + public static final String AUTHENTICATION_MECHANISMS = "drill.exec.security.auth.mechanisms"; + + // Mapping: SASL name -> mechanism + // See AuthenticationMechanism#getMechanismName + private final Map<String, AuthenticationMechanism> mechanisms = CaseInsensitiveMap.newHashMapWithExpectedSize(5); + + @SuppressWarnings("unchecked") + public AuthenticationMechanismFactory(final DrillConfig config, final ScanResult scan, + final LoginManager loginManager) throws DrillbitStartupException { + if (!config.hasPath(ExecConstants.AUTHENTICATION_MECHANISMS)) { + return; + } + + final List<String> configuredMechanisms = config.getStringList(ExecConstants.AUTHENTICATION_MECHANISMS); + logger.debug("Configuring authentication mechanisms: {}", configuredMechanisms); + // transform all names to uppercase + final Set<String> configuredMechanismsSet = Sets.newHashSet(Iterators.transform(configuredMechanisms.iterator(), + new Function<String, String>() { + @Nullable + @Override + public String apply(@Nullable String input) { + return input == null ? null : input.toUpperCase(); + } + })); + + // PLAIN mechanism need special handling due to UserAuthenticator + if (configuredMechanismsSet.contains(PlainMechanism.MECHANISM_NAME)) { + // instantiated here, but closed in PlainMechanism#close + final UserAuthenticator userAuthenticator = UserAuthenticatorFactory.createAuthenticator(config, scan); + final PlainMechanism mechanism = new PlainMechanism(userAuthenticator); + mechanisms.put(PlainMechanism.MECHANISM_NAME, mechanism); + configuredMechanismsSet.remove(PlainMechanism.MECHANISM_NAME); + logger.trace("Plain mechanism enabled."); + } + + // Then, load other mechanisms, if any + if (!configuredMechanismsSet.isEmpty()) { + final Collection<Class<? extends AuthenticationMechanism>> mechanismImpls = + scan.getImplementations(AuthenticationMechanism.class); + logger.debug("Found AuthenticationMechanism implementations: {}", mechanismImpls); + + for (Class<? extends AuthenticationMechanism> clazz : mechanismImpls) { + final SaslMechanism annotation = clazz.getAnnotation(SaslMechanism.class); + if (annotation == null) { + logger.warn("{} doesn't have {} annotation. Skipping.", clazz.getCanonicalName(), SaslMechanism.class); + continue; + } + + final String annotatedName = annotation.name(); + if (Strings.isNullOrEmpty(annotatedName)) { + logger.warn("Authentication mechanism {} does not have a proper {} annotation. Skipping.", --- End diff -- maybe the message should be more explicit about the missing name attribute?
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